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首页> 外文学位 >Interference suppression receiver with adaptive antenna array for code division multiple access communication systems.
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Interference suppression receiver with adaptive antenna array for code division multiple access communication systems.

机译：具有用于码分多址通信系统的自适应天线阵列的干扰抑制接收机。

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摘要

Combining multiuser receivers with antenna arrays has been proposed to provide spatial discrimination between users based on their respective spatial signature and reduce the Multiple Access Interference (MAI) [1, 2]. These receivers will improve a Code Division Multiple Access (CDMA) communication system performance by a combination of the temporal and spatial filtering. While the adaptive antenna array suppresses interfering signals with arrival angles different from that of the desired user, the multiuser receivers suppress or cancel interfering signals whose arrival angles are the same as that of the desired user. Recently an interference suppression receiver for a CDMA communication system was proposed to suppress MAI [3, 4]. This receiver only uses temporal information of the received signals. Adding an antenna array to this receiver to enhance the performance of this receiver is the idea behind this dissertation. A receiver structure combining an adaptive antenna array and interference suppression receiver structure is introduced. A Direction-Of-Arrival (DOA) tracking algorithm, which maximizes the output power of the antenna array for the desired user signal, is proposed. Simulation results are given to support the analyses.; The major contributions in this dissertation are the proposal of a receiver structure which can improve the system performance in [3, 4] and an adaptive DOA tracking algorithm for CDMA communication systems employing antenna arrays. By using the proposed simple operations, the antenna array can track the DOA of the desired user under Additive White Gaussian Noise (AWGN) and Rayleigh fading environments. The algorithm only needs the first order statistics of the interfering signal and noise. No matrix operation is required during the tracking of the desired user's DOA. Hence the algorithm is simple and has less computation burdens per snapshot. Also the DOA tracking algorithm is not sensitive to the mixer phase distortions. A separate array calibration is not required. Hence, the system employing the DOA tracking algorithm has a lower complexity. Simulation results show the performance improvement of the proposed receiver structure and verify the effectiveness of the proposed DOA tracking algorithm.
机译：已经提出将多用户接收机与天线阵列相结合，以根据用户各自的空间特征在用户之间提供空间区分，并减少多路访问干扰（MAI）[1、2]。这些接收器将通过时间和空间滤波的组合来改善码分多址（CDMA）通信系统的性能。在自适应天线阵列抑制到达角与期望用户的到达角度不同的干扰信号的同时，多用户接收机抑制或消除到达角与期望用户的到达角度相同的干扰信号。最近，有人提出了一种用于CDMA通信系统的干扰抑制接收机来抑制MAI [3，4]。该接收器仅使用接收到的信号的时间信息。本文的思想是在接收器上增加天线阵列以增强接收器的性能。介绍了一种将自适应天线阵列和干扰抑制接收机结构相结合的接收机结构。提出了一种到达方向（DOA）跟踪算法，该算法可使所需用户信号的天线阵列的输出功率最大化。给出仿真结果以支持分析。本文的主要贡献是提出了一种可以改善[3，4]中系统性能的接收机结构的建议，以及针对采用天线阵列的CDMA通信系统的自适应DOA跟踪算法。通过使用提出的简单操作，天线阵列可以在加性高斯白噪声（AWGN）和瑞利衰落环境下跟踪所需用户的DOA。该算法仅需要干扰信号和噪声的一阶统计量。在跟踪所需用户的DOA期间不需要矩阵运算。因此，该算法简单，每个快照的计算负担更少。同样，DOA跟踪算法对混频器相位失真也不敏感。不需要单独的阵列校准。因此，采用DOA跟踪算法的系统具有较低的复杂度。仿真结果表明了所提出的接收机结构的性能改进，并验证了所提出的DOA跟踪算法的有效性。

著录项

  • 作者

    Hou, Weiguang.;

  • 作者单位

    Wichita State University.;

  • 授予单位 Wichita State University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 112 p.
  • 总页数 112
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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